How to use the Guide Lines or Guides in the Tile Flooring interface?

Click "Customize-Tile Flooring" and select the wall or floor to enter the tile flooring interface. Select "Guide Lines - Add Guide Lines" above. Click on the side where you want to add the guides, then drag the mouse or type in the spacing distance value to add the guide line. The guides will be shown as dotted lines and when you use the drawing tools, the drawing could snap to the points on the guide line.